Microsensor MPM4881 User manual

MPM4881 Pressure Transmitting Controller
MDM4881 Differential Pressure
Transmitting Controller
Operation Manual
Shaanzhi No. 03000112
Operation Manual

MPM/MDM4881
II
Contents
1 Features................................................................................1
2 Specifications........................................................................2
3 Principle................................................................................4
4 Outline Construction and Installation....................................7
5 Electric Connection...............................................................9
6 Parameters Setting and Usage...........................................11
7 Analog Output Switch..........................................................13
8 Hardware Lock....................................................................14
9 Communication Protocol.....................................................15
Be alert to possible electrostatic hazard! For controller in
normal use, maintenance and cleaning, any danger of
ignition caused by the electric charge shall be prevented;
when it is used in the explosive environment, touching or
scrubbing the controller is strictly prohibited. If user must
touch or scrub the product, please make sure to do it in
places with good ventilation and no gas leakage. Please scrub the product
with wrung-out damp cloth. It is strictly prohibited to clean the controller
housing with dry cloth.
Warning

MPM/MDM4881
III
Our company reserves the modification right for this operation manual due
to renovation of production technology and craftwork. If some information
is changed, no more notice will be edited.
Please pay attention to the latest version.
Our company also reserves the right of final explanation for this manual.
Version: V1.2

1
Thank you very much for selecting Micro Sensor’s product,
please take some time to read this operation manual very
carefully before using the product.
MPM/MDM4881 Pressure / Differential Pressure Transmitting
Controller is a digital meter integrating pressure measurement,
display, transmitting and control together. It adopts the
internationally advanced ARM processing chip. By
compensation and adjustment of the sensor, MPM/MDM4881
can achieve precise measurement, quick response & control of
multiple relays. The controller supports peak value record and
action delay, providing 4 digit LED display, easy for reading.
Multiple buttons make the operation easier and more convenient.
Either current or voltage output signal is available for choice. It
can be installed by back mounting, rail mounting, cover
mounting and joint mounting. Whole product protection is IP65.
MPM/MDM4881 offers 5-relay + 1-analog output. It can be
applied for long-distance pressure measurement and control in
equipment automatic pressure detection, action control and
water level alarm etc. It is also a preferred choice for working
fields where request high frequency / high accuracy switchover
or mechanical pressure relays is incompetent.
1 Features
Real-time pressure display in unit: Bar or MPa
14-segment LED display
Button programming, easy operation
Max. 5 relays control independently, time-delay function

2
Switchable analog output
Record the Max. pressure during operation(button for
clearing up)
Support back, rail, cover and joint mounting
Hardware wrong operation protection
Intrinsically safe products meet GB3836.1 and GB3836.4
standards, and have explosion-proof certification, Exia
mark is Ex ib IIA T6 Gb.
Modbus communication
2 Specifications
Input
Power Supply: Non Intrinsically Safe ：(220±44)V AC/22V~32V
DC;
Intrinsically Safe：22V~28V DC（Supplied by Safety Barrier）
Pressure Range: 0kPa~10kPa..60MPa(MPM4881);
0kPa~35kPa... 3.5MPa(MDM4881);
Overpressure: 1.5FS ;
Static Pressure: 20MPa (MDM4881)
Output

3
Accuracy:≤±0.25%FS;≤±0.5%FS; Repeatability:
≤±0.2%FS;
Display: 4 digit 0.56 inch 14-segment LED display;
Temperature Drift: ≤±0.03%FS/℃(zero/span);
Display Refresh: 200ms.
Analog Output
Current Version: 4mA~20mA DC, Load resistance ≤560Ω；
Voltage Version: 0V~10V DC, Load resistance ≥10kΩ.
Switch Output
Output Mode: 5 relays, normally open or close contact;
Voltage Supply: ≤277V AC;≤30V DC;
Current Supply: ≤3A；Response: < 1ms;
Relay Life: ≥10,000,000times/load (min.);≥100,000times/load
(max.);
Switch Point Setting: 1.5%FS~99%FS;
Return Difference Setting: 1%FS~10%FS;

4
Switch Delay: 0s~99s.
Environmental Conditions
Operation Temperature: -25℃~65℃/-13℉~149℉；
Relative Humility: 0%~85%;
Storage Temperature: -40℃~70℃/-40℉~158℉;
Media Temperature: -20℃~80℃/-50℉~176℉;
Electromagnetic compatibility: GB/T 17626.2/3/4-2006；
Shock: ≤5g/10Hz...500Hz(IEC 60068-2- 6-2007);
Impact: ≤10g/11ms(IEC 60068-2-27-2008);
Protection: IP65
Intrinsically safe explosion proof parameter
Supply terminal, Signal terminal:
Ui: 28V DC Ii: 93mADC Ci: 0.6uF Li: 4.0mH Pi: 0.65W
Relay Output Terminal：
Ui: 10.5V DC Ii: 14mA DC Ci: 0 uF Li: 0mH Pi: 37mW
3 Principle
MPM/MDM4881 Pressure /Differential Pressure
Transmitting Controller is a high performance controller with

5
internationally advanced ARM processing chip. It can process
the process pressure through 1 current output, 1 voltage output,
5-relay output and 1 LED display.
1、Display
When MPM/MDM 4881 is powered on, it displays“MPM” for
seconds, then display real time pressure.
User can set the display (real time pressure, max. pressure,
switch point) at Basic Settings Menu. After MPM/MDM 4881 is
powered on, it can display real time pressure, corresponding
switch point or max. pressure.
2、Output
①Relay output
MPM/MDM4881 has 5-relay output. Each relay can set 1
switch point and 1 hysteresis. When pressure gets to "switch
point", relays will act. When pressure return back to "switch
point-hysteresis", relays back to normal.
“SP1”…“SP5”= Switch point 1…5
“HYS1”…“HYS5”= Hysteresis 1…5
②Set switch point
·Press corresponding button ,eg. "P1"
·Display switch point code, eg. "SP1"
·2 seconds later, it displays real time setting value
·Press“+”or“－”key to change value

6
Press H1 display Set hysteresis
Set switch point
·3 seconds later, it displays the setting value
③Set hysteresis
·Press corresponding button ,eg. "H1"
·Display hysteresis code, eg.“HYS1”
·2 seconds later, it displays real time setting value
·Press“+”or“－”key to change value
·3 seconds later, it displays the setting value
④Analog output
MPM/MDM4881 output 4mA~20mADC or 0V~10VDC
(Please adjust at Basic Settings Menu)
3、Max. value is the max. pressure when MPM/MDM4881 is
started or the last time to be reset
①Display max. pressure ：Press button P4 and H4 at the
same time
Press P1 Display Set switch point
Set hysteresis

7
MPM4881
MI
CR O
麦克
麦克传感器有限公司
MICRO SENSOR CO,.LTD.
（220）
126 81.5
P1
H1
P2
H2
P3
H3
P4
H4
P5
H5
+
-
MDM4881
MI
CR O
麦克
麦克传感器有限公司
MICRO SENSOR CO,.LTD.
（220）
126 81.5
SW22 G1/4 female
P1
H1
P2
H2
P3
H3
P4
H4
P5
H5
+
-
②Reset max. pressure ：Press button P3 and H3 at the
same time
4 Outline Construction and Installation
（1）Construction and Outline Dimension
Unit: mm
Chart 1: MPM4881 Outline Construction and Dimension
Chart 2: MDM4881 Outline Construction and Dimension

8
M PM 48 81
P1
H1
P2
H2
P3
H3
P4
H4
P5
H5
+
-
84
114
4×M5
M20×1.5
SW27
81
109
C5
（2）Installation
Before installation, please make sure the measured
pressure is within MPM/MDM4881 pressure range;
please make sure measured media is compatible with
MPM/MDM4881 material; please make sure the
measured media will not bloke the pressure leading hole
of MPM/MDM4881.
MPM/MDM4881 Pressure / Differential Pressure
Transmitting Controller can be installed by: back mounting,
rail mounting, cover mounting and joint mounting.
35mm electric rail
panel hole size
Chart 5: Cover mounting Chart 6: Joint mounting
union joint
bolt hole size
Chart 3: Back mounting Chart 4: 35mm Electric Rail mounting
Unit：mm
electrical control cabinet panel

9
123456789
10
11
RS485
22 21 20 19 18 17 16 15 14 13 12
relay 1
relay 3relay 4
+
-
BA
+
-
OUT
OUT supply GND
relay 2
relay 5
（3）Panel Rotation
MPM/MDM4881 front panel can be rotated. At the working
site, after MPM/MDM4881 is installed, screw off the 4 bolts on
the panel, rotate panel 180°and screw the 4 bolts tightly again to
make sure that the operator face the display panel.
（4）Wire diameter
Terminal cover uses PG11 plastic flat cable gland which is
suitable for cable with outer diameter 7mm~10mm. When
making wire connection, please make sure the wire diameter is
within 7mm~10mm in order for good sealing. The controller
waterproof joint is equipped with two metal sheets. Please keep
them well. When there is no cable for either connection port,
please use the metal sheet to seal the connection port for good
sealing.
5 Electric connection
Chart 7: Terminal chart

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Controller terminals：
Terminal 1#Grounding
Terminal 2#3#AC, DC Power supply double use
Terminal 4#5#Analog output terminal
Terminal 6#7#8#Relay1 output
Terminal 12#13#RS485
Terminal 9#10#11#Relay2 output
Terminal 14#15#16#Relay3 output
Terminal 17#18#19 #Relay4 output
Terminal 20#21#22#Relay5 output
Intrinsically Safe Electric Connection:
The intrinsically safe transmitter applies to the explosive
environment. When the electrical connection is conducted, it
should be used together with the Safety Barrier to form a
Intrinsically- safe explosion proof system. Safety Barrier and
Power are placed at Non-hazardous area; the intrinsically-safe
transmitter is placed at Hazardous area, please pay attention to
the safety grounding.
The safety barrier can be purchased at customer’s will only if
it meets the parameters requirement above and has
explosion-proof certification. Install and use the safety barrier
according to its manual.

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Pressure/DP transmitting controller：ExibIIAT6 Gb
Safety Barrier Output Explosion Proof Parameters：[Exib Gb]IIA
Supply terminal, Signal terminal:
Ui：28V DC Ii：93mADC Uo：28V DC Io：93mA DC
Li：4.0mH Ci：0.6uF Pi：0.65W Po：0.65W
Relay Output Terminal：
Ui：10.5V DC Ii：14mA DC Uo：10.5V
DC Io：14mA DC
Li：0mH Ci：0 uF Pi：37mW Po：37mW
6 Parameters Setting and Usage.
In order to use controller in different working site, user can
set functions through Basic Settings Menu.

12
①Set basic setting
Close and store Basic Settings Menu: Press button P1 and
H1 at the same time, enter the "MENU", then press button P1 or
H1 to choose "EXIT" ,then choose "+" or "-" to set "YES", 2
seconds later, controller returns back to normal display mode.
If user do not store the setting parameter, choose "NO" and
exit.
②Basic Settings
Settings
Display
Setting
range
Default
If time delay (Ton1) of relay 1
is started, it must wait the
setting time before relay 1
acts when pressure gets to or
overpasses the corresponding
switch point.
0s~99s
0.0
If time delay (Toff1) of relay 1
is closed, it must wait the
setting time before relay 1
switches when pressure gets
to or overpasses the
corresponding return back
0s~99s
0.0

13
①To switch analog output 4~20mA and 0~10V, please open front
panel, switch white dial on the upper left of base board to correct
position (I: 4 mA~20mA DC current output; V: 0V~0V DC voltage
output).
7 Analog output switch
（1）The controller integrates 4mA ~20mA current and 0 V
~10V voltage analog output together. It can meet different
clients' requirements. Before the controller is out of factory, it
sets according to customer's request. User do not need to adjust.
point.
It is the same for relay 2-5.
（Primary：3 options）
“ACT”：real time pressure
“SP1”...“SP5”：Switch 1~5
“MAX”：max. pressure
ACT/
SP1...SP
5/
MAX
ACT
（Unit）
MPa/bar
MPa
（Output）①
“MAMP” ：4mA~20mA current
“VOLT”：0V~10V voltage
MAMP/
VOLT
MAMP
Close and store basic settings
（Exit）
YES/NO
YES
Back to factory settings
（Reset）
YES/NO
YES
Zero clearing（Zero）
YES/NO
YES

14
But due to working site application, user may need to switch the
analog output into another, please make sure to disconnect the
controller with other equipments; After switching the analog
output, please make sure the following equipments change
output into suitable types to match with controller. Wrong electric
connection may damage the controller as well as other
equipments.
（2）If user want to switch the analog output, please open the
front panel first, then switch the white dial on upper left of base
board to correct position (I: 4 mA~20mA DC current output; V:
0V~0V DC voltage output). Then press button P1 and H1 at the
same time ,enter the Basic Settings Menu , choose "+" or "-" at
"OUTP" to set analog output value (MAMP: 4mA ～20mA DC
current output, VOLT: 0V～10VDC output)
Note: please make sure the output is consistent with the
switch dial on the base board, otherwise, the output signal will
not be accurate.
8 Hardware Lock
In order to prevent non-professional operator from
operating or setting the controller wrongly, the controller is
equipped with hardware lock at the back of front panel. When
professional operator finish setting the controller, please open
the front panel, switch the red dial to "LOCK", then screw the
panel tightly again. Under such situation, non-professional
operator can only set relay switch point, hysteresis. Other
advanced settings are not available for setting. If professional

15
operator needs to do advanced settings, please switch the red
dial to "ON" and do settings.
9 Communication Protocol
MPM/MDM4881 has RS485 communication interface, if
users want to communicate with the controller and make digital
processing through RS485, please download MPM/MDM4881
communication protocol on our website. Please pay attention to
latest version software on our website, no more notice will be
edited.
ATTENTION
1. Before operating the instrument, please read this Manual
and electric connection diagram carefully.
2. If you have no standard pressure source, be sure not to
adjust the unit; if necessary, please invite the specialist do
it.
3. please do not stab the diaphragm with hands or anything
sharp to avoid damaging the product.
4. Under the strong interference, please make sure to
connect the housing with earth wire well.
5. Explosion-proof transmitter shall be used in accordance

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with GB3836.15-2000 Electrical Apparatus for explosive
gas atmosphere Part 15 General Requirement, and
provisions concerning Electrical Installation (not including
Mining products) at Hazardous Area.
6. Explosion-proof products are not allowed to replace the
component or structure, so as not to affect its
explosion-proof performance.
WARRANTY
Within one year from the delivery date, we shall repair or
replace the instrument with any quality fault caused by material
parts or our manufacturing technique free of charge. For
non-quality malfunction during user’s operation, we are in
charge of repair. But the material cost and the shuttle
transportation fees should be borne by users.

MICRO SENSOR CO . , LTD.
www.microsensor.cn
Address：NO. 18 Yingda Rd,Baoji, Shaan
Xi,China,721006
Tel：[phone]
Fax：[phone]
邮编：721006